Check out these 7 real estate fun facts around the world.

Rather than building up, affluent people in central London are building down, creating mega-basements. These mega-basements are nicknamed “iceberg homes” - there’s more square footage under the ground than above.

Number 4 is considered an unlucky number in China because it is nearly homophonous to the word “death” (pinyin sǐ). In a study of five years’ worth of real estate sales in the greater Vancouver area, researchers found that houses in Chinese neighborhoods with an address containing '4' sold for an average of $8,000 less than their luckier counterparts. Side note: "Zillow Talk" confirms this fact.

If you’re selling a property in California and if someone's died in it within the last 3 years, it’s considered a material defect and must be disclosed by the seller, unless the death was due to AIDS - that’s discrimination.

India’s richest person, Mukesh Ambani, built a $1 billion home. It has 27 habitable floors, including six parking floors for the capacity of up to 168 cars. The staff of 600 people maintains the home.